title: Generation and evolution of the terahertz vortex beam.
abstract: Based on the complementary V-shaped antenna structure, ultrathin vortex phase plates are designed to achieve the terahertz (THz) optical vortices with different topological charges. Utilizing a THz holographic imaging system, the two dimensional complex field information of the generated THz vortex beam with the topological number l=1 is directly obtained. Its far field propagation properties are analyzed in detail, including the rotation, the twist direction, and the Gouy phase shift of the vortex phase. An analytic Laguerre-Gaussian mode is used to simulate and explain the measured phenomena. The experimental and simulation results overlap each other very well.
authors.forename: Jingwen
authors.initials: J
authors.lastname: He
authors.forename: Xinke
authors.initials: X
authors.lastname: Wang
authors.forename: Dan
authors.initials: D
authors.lastname: Hu
authors.forename: Jiasheng
authors.initials: J
authors.lastname: Ye
authors.forename: Shengfei
authors.initials: S
authors.lastname: Feng
authors.forename: Qiang
authors.initials: Q
authors.lastname: Kan
authors.forename: Yan
authors.initials: Y
authors.lastname: Zhang